[LLVMdev] Testing LLVM on OS X

[Patrick Flanagan]

I'm interested in getting LLVM running on OS X so I can play around 
with it and check it out. I downloaded the LLVM 1.2 package and 
compiled and installed with no errors (used config options 
--with-llvmgccidr and --enable-spec2000 pointing to the relevant 
directories). I want to look at performance of SPEC CPU2000 with LLVM 
vs gcc.

I was able to successfully compile and run the hello world program 
using LLVM. I then made a simple spec config file to try to compile 
spec with LLVM:

ext=ppc32_llvm
teeout=yes
teerunout=yes;
default=default=default=default:
#
CC=/Users/patrick/Desktop/LLVM/cfrontend/ppc/llvm-gcc/bin/gcc
CXX=/Users/patrick/Desktop/LLVM/cfrontend/ppc/llvm-gcc/bin/llvmg++
FC=g77
OPTIMIZE   = -O3 -fomit-frame-pointer

To test that everything was setup correctly, I tried doing just the 
164.gzip test first. It seemed to build the gzip test without errors, 
but when it tried to run it, it said that it couldn't find the bytecode 
file for that program. I looked at the files generated from the build, 
and there's a script that calls lli and passes it a bc file, but sure 
enough the .bc file is not there. I realize this is sort of a spec 
question rather than a LLVM question, but where would it put that .bc 
file and where do I need to copy that file to in order for it to work?

Second, according to the documentation, the OS X version of LLVM 
doesn't generate native code and is run through the interpreter. I 
assume this would make it a lot slower than if it did generate native 
code. Is anyone currently working on making it generate native ppc code 
for OS X? If not, what would be involved in doing so? I'm new to LLVM, 
I'd appreciate some pointers to some info that might shed some light on 
that.

Looks like a really interesting project! Thanks in advance!

Patrick